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bigrex last won the day on May 8 2014

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About bigrex

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    Rock Inspector

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    Hunt/Collect gems, minerals, fossils, corundum (sapphires, rubies), trilobites. Nuggetshooting, Computer, music, art, guns etc.

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  1. Green River Formation has world class specimens, but too young for trilobites or there are none in the deposit.
  2. Dolomite caught up in a basaltic lava flow? No idea, but they both look like fairly nondiscript gray rocks, no very easily identifiable minerals as far as what photos would tell.
  3. From the photos, I would guess quartz, if it's softer, then maybe calcite.
  4. Great stuff, especially for Utah, may I presume that is Amasa Valley gold?
  5. I don't seem to see anything that would indicate there is a brachiopod there.
  6. Thought some of you guys might appreciate this presentation about the mines that produced wulfenite in Arizona. He goes through quite a few mines across the state, and shows all sorts of specimen examples as well as some photos of the mines.
  7. Is it opaque, is it of metallic or glassy luster? Hard to tell in the photos. Does it seem heavy for it's size?
  8. Could be all sorts of things, calcite veins on limestone, quartz veins on a metamorphic rock, etc.
  9. Looks potentially sedimentary, not sure of much else.
  10. Lots of rocks are tough to identify by photo, minerals can be easier.
  11. Russia refurbed them during the cold war and then they were stored in cosmoline. It would take over $1000 to reproduce them today. Prices keep going up on them, just a few years ago you could get one for $89, last I checked in Cabelas they wanted $450, of course Cabelas always charges more. Ammo for them used to be 17 cents a round, but that is no longer the case.
  12. What he says is true, you will find much more at the pay place. However, going off to look on your own at least gives you a chance to find a rarer type of trilobite. At the pay place they keep the layers and beds that seem to have rarer specimens roped off from customers. I'm not sure if they actually confiscate specimens if someone were somehow able to finder a rarer species, but it's not likely they will find one anyway. There's one spot I need to revisit where I found the bottom half of a really large one. Unfortunately, I set it down for a moment and then was unable to find it again after looking everywhere at dusk. Still, it was evidence of larger/rarer trilobite species in the area. I tend to try to avoid the black shale myself. Prefer the Marjum Formation and Weeks Formation to the Wheeler Shale. Below is the first trilobite I ever found that I mentioned in some of our correspondence. It's a Modocia Typicalis in tan shale of the Marjum Formation. They aren't that concentrated in that area, but there are some there. Maybe a little more like nuggetshooting in a sense. At the pay place the value of the trilobites will normally run from approx. $5 to $20 vs. $80 to $300+ for rarer specimens.
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